Draft-rigging.



P aten'ted Feb. Il, |902.

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M www W. M.' PIPER.

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(App1iction tiled Jan. 16, 1901.. Renewd Aug.l 17, 1901.)

(No Model.)-

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UNITED STATES PATENT OEEIoE.,

WILLIAM MORGAN PIPER,'OF ALLEGHENY, PENNSYLVANIA.

DRAFT-HIGGING.

SPECIFICATION forming bart of Letters Patent No. 693,334,0lated February 11, 1902. Application filed January 16, 17901. Renewed August 17, 1901. Serial No. 72,419. (No model.)

To all whom, it may concern:

Be it known that I, WILLIAM MORGAN PIPER, of Allegheny, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Draft-Rigging, of

which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this speciiication, in which- Figure l is a plan view, partly broken away,of a draft-rigging constructed in accordance with my invention. Figs. 2, 3, 4, and 5 are similar views showing modified forms, and Fig. 6 is a longitudinal section of the form of Fig. 5.

My invention relates to that class of draft# riggings wherein springpressed blocks or parts are actuated by coacting inclined snrfaces When a pulling or buiing strain is exerted upon the draw-bar; and its object is to increase the frictional resistance of the device without materially enlarging the space occupied or increasing the number of parts.

In the drawings, referring to the form of Fig. 1, 2 2 represent the draft timbers or iron, and 3 the draw-bar having yoke 4. Fitting within the ends of this yoke are the transverse blocks 5 5, having vinclined surfaces 6 6, which coact with similar surfaces upon blocks 7 7, which are arranged to slide toward and from each other in plane transverse to the axis of the draw-bar. These blocks 7 are normally forced apart and held in the position shown by springs S 8, interposed between them and held in position by suitable bosses or projections 9, entering the ends of the,

spiralspring.' Between the two sets of blocks 7 is interposed a transverse follower l0, having flat front and rear faces which iit upon the iiat end faces of the blocks 7 7.

In the operation of the device when a pull- .ing or bufting strain is exerted upon the drawbar one of the end blocks 5 5, through the inclines 6, forces the blocks 7 7 inwardly against the friction of the inclined surfaces and resistance of the springs, andthis one set of blocks v7, sliding over the flat face of the follower 10, gives an increased frictional resist ance. At the same time the follower 10 is forced along and, pressing upon the other set of blocks 7 7, causes them to move inwardly under the saine resistanoes as the first set.

with the blocks 5 resting against the stops 11, secured to the draft-irons. i

In the form of Fig. 2 the end blocks 5 are made with flat transverse faces, and the follower l0a is provided with the inclined faces 6H, coacting with similar faces on the' end blocks 7a. The action in this form is similar to that of the first form, the blocks 7a moving inwardly on the inclined surfaces at one end, their other iiat faces slidingover the fiat faces of the end blocks 5a.

In the formof Fig.- 3 the end blocks 5b are provided with curved faces 6b instead of iiat inclines, the parts being otherwise similar to those of Fig. 1.

In Fig. 4c I show a simple form, in which a single end block 5c is used with a single set of blocks 7 c and a single follower 10C. In this form the pulling strain will act through one of the blocks 5c or 10c upon the blocks 7c, while bufng strain will act through the other of said blocks. The blocks 7c are moved inwardly against the action of the springs 80 and the frictional resistance between its Hat faces and the block 10c and the curved faces and the block 5C. v

In the form of-Figs. 5 and 6 I show the parts arranged to act in succession, the one set of blocks moving a certain distance before the other blocks are acted upon. In this form I employ two followers 10d, between which is placed a stop 12, which is secured at its top and bottom lto the yoke 4d, as shown in Fig. 6. In this form I have also shown two springs 8d between the rear set of blocks 7d and one spring betweenthe front set of blocks 7d, though this may be varied as desired. In this form the stops lldare so placed that in the normal position of the parts the end blocks 5d are held a short distance inside the abutting ends of the yoke 4d, so that the yoke will move a certain distance in either direction before one of its ends acts'npon one of the end blocks 5d. lIn the operation of this form the bufing or pulling strain first acts through the facing block or stop l2 and through one of the followers 10d, which actuates one set of blocks'7d. After a certain endwise movement of the yokethe end of IOO this yoke contacts with the other of the blocks 5d than that coacting with the blocks 7 l first actuated, and the yoke thus brings the second set of blocks into play at a determined interval after the first set. The strain is thus taken up gradually, while the system is still simple and of comparatively few parts.

The advantages of my invention Will be apparent to those skilled in the art since an increased frictional resistance is afforded by reason of the flat-face followers without complicating or increasing materially the expense of the rigging. Moreover, by the use of the forms of Figs. 5 and 6 or similar form a successive action of the sets is afforded.

Many changes may be made in the form and arrangement of the parts Without departing from my invention.

I claim- I. In a draftrigging, a transverse movable block having inclined surfaces, a pair of blocks having inclined surfaces coacting therewith and movable toward and from each other, a flat-face transverse follower bearing upon fiat opposite end faces of the pair of movable blocks, and a spring to retain a pair of blocks in their normal position; substantially as described.

2. In a draft-rigging, a pair of transverselyextending blocks, and an intermediate transverse follower between them, at least one of said parts having inclined actuating faces, pairs of blocks arranged to move toward and from each other, and having inclined faces c0- acting with the inclined faces before mentioned, and having also fiat transverse friction-faces, and springs arranged to hold the pairs of blocks in normal position; substantially as described.

3. A draft-rigging having two sets of springpressed friction-block devices, a yoke surrounding said devices, and a spacer-block between the devices and secured to the yoke, said spacer-block being arranged to actuate one set of blocks before the yoke acts upon the second set; substantially as described.

In testimony whereof I have hereunto set my hand.

WILLIAM MORGAN PIPER.

Titnessesz GEORGE B. BLEMING, WARREN W. SWARTZ. 

